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1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX |
3 | * operating system. INET is implemented using the BSD Socket |
4 | * interface as the means of communication with the user level. |
5 | * |
6 | * Authors: Lotsa people, from code originally in tcp |
7 | * |
8 | * This program is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU General Public License |
10 | * as published by the Free Software Foundation; either version |
11 | * 2 of the License, or (at your option) any later version. |
12 | */ |
13 | |
14 | #ifndef _INET6_HASHTABLES_H |
15 | #define _INET6_HASHTABLES_H |
16 | |
17 | |
18 | #if IS_ENABLED(CONFIG_IPV6) |
19 | #include <linux/in6.h> |
20 | #include <linux/ipv6.h> |
21 | #include <linux/types.h> |
22 | #include <linux/jhash.h> |
23 | |
24 | #include <net/inet_sock.h> |
25 | |
26 | #include <net/ipv6.h> |
27 | #include <net/netns/hash.h> |
28 | |
29 | struct inet_hashinfo; |
30 | |
31 | static inline unsigned int inet6_ehashfn(struct net *net, |
32 | const struct in6_addr *laddr, const u16 lport, |
33 | const struct in6_addr *faddr, const __be16 fport) |
34 | { |
35 | u32 ports = (((u32)lport) << 16) | (__force u32)fport; |
36 | |
37 | return jhash_3words((__force u32)laddr->s6_addr32[3], |
38 | ipv6_addr_jhash(faddr), |
39 | ports, |
40 | inet_ehash_secret + net_hash_mix(net)); |
41 | } |
42 | |
43 | static inline int inet6_sk_ehashfn(const struct sock *sk) |
44 | { |
45 | const struct inet_sock *inet = inet_sk(sk); |
46 | const struct ipv6_pinfo *np = inet6_sk(sk); |
47 | const struct in6_addr *laddr = &np->rcv_saddr; |
48 | const struct in6_addr *faddr = &np->daddr; |
49 | const __u16 lport = inet->inet_num; |
50 | const __be16 fport = inet->inet_dport; |
51 | struct net *net = sock_net(sk); |
52 | |
53 | return inet6_ehashfn(net, laddr, lport, faddr, fport); |
54 | } |
55 | |
56 | extern int __inet6_hash(struct sock *sk, struct inet_timewait_sock *twp); |
57 | |
58 | /* |
59 | * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so |
60 | * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM |
61 | * |
62 | * The sockhash lock must be held as a reader here. |
63 | */ |
64 | extern struct sock *__inet6_lookup_established(struct net *net, |
65 | struct inet_hashinfo *hashinfo, |
66 | const struct in6_addr *saddr, |
67 | const __be16 sport, |
68 | const struct in6_addr *daddr, |
69 | const u16 hnum, |
70 | const int dif); |
71 | |
72 | extern struct sock *inet6_lookup_listener(struct net *net, |
73 | struct inet_hashinfo *hashinfo, |
74 | const struct in6_addr *saddr, |
75 | const __be16 sport, |
76 | const struct in6_addr *daddr, |
77 | const unsigned short hnum, |
78 | const int dif); |
79 | |
80 | static inline struct sock *__inet6_lookup(struct net *net, |
81 | struct inet_hashinfo *hashinfo, |
82 | const struct in6_addr *saddr, |
83 | const __be16 sport, |
84 | const struct in6_addr *daddr, |
85 | const u16 hnum, |
86 | const int dif) |
87 | { |
88 | struct sock *sk = __inet6_lookup_established(net, hashinfo, saddr, |
89 | sport, daddr, hnum, dif); |
90 | if (sk) |
91 | return sk; |
92 | |
93 | return inet6_lookup_listener(net, hashinfo, saddr, sport, |
94 | daddr, hnum, dif); |
95 | } |
96 | |
97 | static inline struct sock *__inet6_lookup_skb(struct inet_hashinfo *hashinfo, |
98 | struct sk_buff *skb, |
99 | const __be16 sport, |
100 | const __be16 dport) |
101 | { |
102 | struct sock *sk = skb_steal_sock(skb); |
103 | |
104 | if (sk) |
105 | return sk; |
106 | |
107 | return __inet6_lookup(dev_net(skb_dst(skb)->dev), hashinfo, |
108 | &ipv6_hdr(skb)->saddr, sport, |
109 | &ipv6_hdr(skb)->daddr, ntohs(dport), |
110 | inet6_iif(skb)); |
111 | } |
112 | |
113 | extern struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo, |
114 | const struct in6_addr *saddr, const __be16 sport, |
115 | const struct in6_addr *daddr, const __be16 dport, |
116 | const int dif); |
117 | #endif /* IS_ENABLED(CONFIG_IPV6) */ |
118 | #endif /* _INET6_HASHTABLES_H */ |
119 |
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